Matt,
I presume he's talking about chum and pink smolts which head down to salt water as soon as they swim up from the gravel. at this point they are only 1 to 1 1/4 inches in length.

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Yeah, I was trying to think if a small imitation with just a bit of the egg sac hanging off would be the trick. Or just the standard 6" hare and marabou streamer. Either way, I wish I had time to jump on this one.

If the egg sac has not been fully absorbed the critter is, technically, an alevin (pronounced al'-a-vin). Most, if not all, chum and pink smolts have completely absorbed the egg sac before they enter salt water.